3917561 has 2 divisors, whose sum is σ = 3917562. Its totient is φ = 3917560.

The previous prime is 3917549. The next prime is 3917587. The reversal of 3917561 is 1657193.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 3534400 + 383161 = 1880^2 + 619^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-3917561 is a prime.

It is an Ulam number.

It is not a weakly prime, because it can be changed into another prime (3917161) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1958780 + 1958781.

It is an arithmetic number, because the mean of its divisors is an integer number (1958781).

Almost surely, 2^3917561 is an apocalyptic number.

It is an amenable number.

3917561 is a deficient number, since it is larger than the sum of its proper divisors (1).

3917561 is an equidigital number, since it uses as much as digits as its factorization.

3917561 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 5670, while the sum is 32.

The square root of 3917561 is about 1979.2829509699. The cubic root of 3917561 is about 157.6419950659.

The spelling of 3917561 in words is "three million, nine hundred seventeen thousand, five hundred sixty-one".